Sunday, September 10, 2017

TRB Mechanical Solved Question on Venturimeter

Appearing for TRB Polytechnic Lecturer Exam 2017 ? Want some solved questions for Mechanical Engineering? Here is a question which was asked in the TRP Engineering College previous year exam held in 2016. This question is under the Syllabus of Fluid Mechanics and Machinery. The question is not widely available in the internet except few book results where only question is available. No answer can be found in the internet for the following question and thus we have come here with a solution which will give an idea for those who are preparing the TRB exam very seriously. Here is the question and its solution. This question was also asked in GATE 2005 exam

Question: A venturimeter of 20 mm throat diameter is used to measure the velocity of water in a horizontal pipe of 40 mm diameter. If the pressure difference between the pipe and throat sections is found to be 30 kPa then, neglecting frictional losses, the flow velocity is:
(a) 0.2 m/s
(b) 1.0 m/s
(c) 1.4 m/s
(d) 2 m/s

The Solution in detail:
You will find the explanation for the answer below.


TRB Mechanical Solved Question on Laminar Flow Maximum Velocity

Going to write the TRB Polytechnic Lecturer Exam 2017 ? Want some solved questions for Mechanical Engineering? Here is a question which was asked in the previous year exam (Engineering College Exam) held in 2016. This question comes under the Syllabus of Fluid Mechanics and Machinery (Laminar Flow). The question is not widely available in the internet. No answer can be found in the internet for the following question and thus we have come here with a solution which will give an idea for those who are preparing the TRB exam very seriously. Here is the question and its solution.

Question: Laminar Developed flow at an average velocity of 5 m/sec occurs in a pipe of 10 cm radius. The velocity at 5 cm radius is, 
A) 7.5 m/sec B) 5 m/sec C) 2.5 m/sec  D) 10 m/sec

The Solution in detail:
You will find the explanation for the answer below. As the maximum velocity occurs at the centre for laminar flow, the calculation is made accordingly. See the attachment for solution.

TRB Mechanical Solved Question on Hydraulic Pump

Appearing for TRB Polytechnic Lecturer Exam 2017 ? Want some solved questions for Mechanical Engineering? Here is a question which was asked in the previous year Engineering Services exam held in 2007. This question are under the Syllabus of Fluid Mechanics and Machinery and expected to be appeared in upcoming TRP examinations. The question is not widely available in the internet except few book results where only question is available. No answer can be found in the internet for the following question and thus we have come here with a solution which will give an idea for those who are preparing the TRB exam very seriously. Here is the question and its solution.

Question: In a pump, the discharge is halved. Presuming the speed remains unchanged, then what would be the ratio of heads H1 / H2 ?
A) √(1/3)
B) √(2/3)
C) (0.25)^1/3
D) (0.5)^1/3

The Solution in detail:
You will find the explanation for the answer below.

Monday, August 28, 2017

TRB Mechanical Solved Question on Specific Speed of Impulse Turbine

Appearing for TRB Polytechnic Lecturer Exam 2017 ? Want some solved questions for Mechanical Engineering? Here is a question which was asked in the previous year exam held in 2012. This question comes under the Syllabus of Fluid Mechanics and Machinery. The question is not widely available in the internet except few book results where only question is available. No answer can be found in the internet for the following question and thus we have come here with a solution which will give an idea for those who are preparing the TRB exam very seriously. Here is the question and its solution.

Question: An impulse turbine operating with a single nozzle has a specific speed of 5. What will be the approximate specific speed of the turbine if the turbine is operated with one more additional nozzle of the same size?
A) 4 B) 6 C) 7 D) 10

The Solution in detail:
You will find the explanation for the answer below.

TRB Mechanical Solved Question on Two Pelton Wheel

Are you preparing for TRB Polytechnic Lecturer Exam 2017 ? Want some solved questions for Mechanical Engineering? Here is a question which was asked in the previous year exam held in 2012. This question comes under the Syllabus of Fluid Mechanics and Machinery. The question is not widely available in the internet except few book results where only question is available. No answer can be found in the internet for the following question and thus we have come here with a solution which will give an idea for those who are preparing the TRB exam very seriously. Here is the question and its solution.

Question: Two Pelton wheels A and B have the same specific speed and are working under the same head. Wheel A produces 400 kW at 1000 rpm . If B produces 100 kW, then its speed is,
A) 4000 rpm B) 2000 rpm C) 1500 rpm D) 1250 rpm

The Solution in detail:
You will find the explanation for the answer below.